CN101788361B - System for detecting low charge of refrigerant in air conditioner protection system - Google Patents
System for detecting low charge of refrigerant in air conditioner protection system Download PDFInfo
- Publication number
- CN101788361B CN101788361B CN201010105282.3A CN201010105282A CN101788361B CN 101788361 B CN101788361 B CN 101788361B CN 201010105282 A CN201010105282 A CN 201010105282A CN 101788361 B CN101788361 B CN 101788361B
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- Prior art keywords
- low charge
- air
- vehicle
- value
- conditioning
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60H—ARRANGEMENTS OF HEATING, COOLING, VENTILATING OR OTHER AIR-TREATING DEVICES SPECIALLY ADAPTED FOR PASSENGER OR GOODS SPACES OF VEHICLES
- B60H1/00—Heating, cooling or ventilating [HVAC] devices
- B60H1/00642—Control systems or circuits; Control members or indication devices for heating, cooling or ventilating devices
- B60H1/00978—Control systems or circuits characterised by failure of detection or safety means; Diagnostic methods
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60H—ARRANGEMENTS OF HEATING, COOLING, VENTILATING OR OTHER AIR-TREATING DEVICES SPECIALLY ADAPTED FOR PASSENGER OR GOODS SPACES OF VEHICLES
- B60H1/00—Heating, cooling or ventilating [HVAC] devices
- B60H1/00507—Details, e.g. mounting arrangements, desaeration devices
- B60H1/00585—Means for monitoring, testing or servicing the air-conditioning
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60H—ARRANGEMENTS OF HEATING, COOLING, VENTILATING OR OTHER AIR-TREATING DEVICES SPECIALLY ADAPTED FOR PASSENGER OR GOODS SPACES OF VEHICLES
- B60H1/00—Heating, cooling or ventilating [HVAC] devices
- B60H1/32—Cooling devices
- B60H1/3204—Cooling devices using compression
- B60H1/3205—Control means therefor
- B60H1/3214—Control means therefor for improving the lubrication of a refrigerant compressor in a vehicle
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60H—ARRANGEMENTS OF HEATING, COOLING, VENTILATING OR OTHER AIR-TREATING DEVICES SPECIALLY ADAPTED FOR PASSENGER OR GOODS SPACES OF VEHICLES
- B60H1/00—Heating, cooling or ventilating [HVAC] devices
- B60H1/32—Cooling devices
- B60H2001/3236—Cooling devices information from a variable is obtained
- B60H2001/3248—Cooling devices information from a variable is obtained related to pressure
- B60H2001/325—Cooling devices information from a variable is obtained related to pressure of the refrigerant at a compressing unit
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60H—ARRANGEMENTS OF HEATING, COOLING, VENTILATING OR OTHER AIR-TREATING DEVICES SPECIALLY ADAPTED FOR PASSENGER OR GOODS SPACES OF VEHICLES
- B60H1/00—Heating, cooling or ventilating [HVAC] devices
- B60H1/32—Cooling devices
- B60H2001/3236—Cooling devices information from a variable is obtained
- B60H2001/3255—Cooling devices information from a variable is obtained related to temperature
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60H—ARRANGEMENTS OF HEATING, COOLING, VENTILATING OR OTHER AIR-TREATING DEVICES SPECIALLY ADAPTED FOR PASSENGER OR GOODS SPACES OF VEHICLES
- B60H1/00—Heating, cooling or ventilating [HVAC] devices
- B60H1/32—Cooling devices
- B60H2001/3236—Cooling devices information from a variable is obtained
- B60H2001/3266—Cooling devices information from a variable is obtained related to the operation of the vehicle
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K2201/00—Application of thermometers in air-conditioning systems
- G01K2201/02—Application of thermometers in air-conditioning systems in vehicles
Landscapes
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Air-Conditioning For Vehicles (AREA)
Abstract
A system for detecting a low charge condition in an air conditioner for a vehicle. The system first determines whether noise factors are present that would interfere with reliably measuring a pressure delta. If noise factors are not present, the system determines a pressure delta value for the compressor by comparing the high side pressure when the clutch is engaged to a high side pressure when the clutch is disengaged. If the pressure delta value is less than a threshold value, a low charge condition may be recorded. When the number of low charge conditions detected exceeds a predetermined number of events, the system may set a temperature diagnostic trouble code, disable the air conditioning system and alert the driver of a potential problem. According to the invention, the micro loss of the refrigerant can be detected before the damage of the compressor with no need for the additional pressure and temperature sensor of the air conditioner.
Description
Technical field
The whether lower system of refrigerant charge degree in the present invention relates to detect vehicle air conditioner in the system of utilizing truck-mounted computer software and the input of existing sensor.
Background technology
Vehicle air conditioner passes cold-producing medium to comprise the closed circuit circulatory system circulation of compressor, heat exchanger and expansion gear.If air-conditioning system is lost a large amount of refrigerant charge amounts, the performance degradation of air-conditioning system.If lose a large amount of refrigerant charge, air-conditioning system may produce fault.
The loss of cold-producing medium has reduced the oil mass circulating in system.If the loss of cold-producing medium is larger, compressor may oil starvation, and this can cause compressor fault.The loss of cold-producing medium also can cause compressor that air-conditioning system is evacuated to vacuum, and this also can make compressor lack oil.If compressor continues operation under oil starvation situation, compressor can finally produce fault.
After compressor fault, other damage assembly of changing compressor and maintenance air-conditioning system is very expensive.On the contrary, if the loss of cold-producing medium detected before compressor damage, the cost of the air-conditioning system that maintenance is slowly leaked is just changed the sub-fraction of the cost of fault compressor.Most of vehicle driver can not determine before air-conditioning breaks down whether air-conditioning system has the low charge of cold-producing medium.
Existing proposal increases a plurality of pressure and temperature sensors that spread all over air-conditioning system to form the low charge detection system of air-conditioning refrigerant.Yet, be difficult to be reduced in the cost that increases extra pressure and temperature sensor in air-conditioning system.Need a kind of low charge monitoring policy without increasing the extra pressure and temperature sensor that spreads all over air-conditioning system.Also need a kind ofly the low charge detection system of cold-producing medium small loss can before compressor produce to damage, be detected.
As described below, system of the present invention has solved these and other problems.
Summary of the invention
Air-conditioning system is provided with conventional sensor group generally, comprises expansion core thermistor, high pressure sensor and pressure switch.The impact that conventional sensors group can be subject to disturbing in system, and can not to lower the making accurately of system charge, determine reliably.The present invention proposes a kind of can with for controlling the software solution using together with the conventional sensors group of air conditioning function.Other shared vehicle-state indicator and sensor are used for filtering previous obstruction conventional sensors group and make exactly determined disturbing factor to system charge is lower.
Thereby whether the software algorithm that receives input from sharing vehicle-state indicator and sensor makes conventional sensors group that the reliable indication to system charge state is provided with enough stability operations for definite air-conditioning system.Can whether with relatively stable state, turn round by the one or more indication air-conditioning systems in following factors: the speed of a motor vehicle, engine speed (rpm), vehicle acceleration, rotation speed of the fan, the existence of precipitation, the change of air-conditioning steering order etc.Otherwise conventional sensors group can cause the mistake of lower air-conditioning charge level to indicate and provide insecure indication.
Power drive system module can be managed the software that monitors air-conditioning charge easily, because provide sensor signal and the indication of other vehicle-state to it.Alternately, can be monitored by HVAC climate controlling module or the management of other processing unit the software of air-conditioning charge level.
According to the present invention, first determine whether vehicle just turns round with stable state.The characteristic of required stable state is scheduled to, and can be according to multiple vehicle operation parametric calibration.Can be based on indication stable states such as the speed of a motor vehicle, engine rpm, vehicle accelerations.Once determine vehicle, just with predetermined stable state running, determine whether air-conditioning system circulates (air-conditioning system is opened and closed) to satisfy the demands.Next step, system can determine whether to rain by test wiper state or precipitation sensor state, can skip in this case the state verification of air-conditioning charge.As used herein, wiper actuation indicator is interpreted as the humidity sensor of a type.Need to during precipitation, skip air-conditioning charge state verification program, because the efficiency of condenser and the performance low air-conditioning charge of indication that can lead to errors in air-conditioning system.
If determine vehicle with steady state (SS) running and do not have precipitation, obtaining data sample from high side pressure sensor in the complete air-conditioning compressor cycle (compressor opens and cuts out).Difference while calculating in compressor cycle high side pressure and clutch separation when clutch coupling engages between high side pressure is to provide pressure differential.Subsequently pressure differential is compared with threshold value or critical value.This threshold value or critical value are for offering the calibration value of the built-in variable of power train control module or alternative HVAC control module or other processing unit based on engine rpm, the speed of a motor vehicle, environment temperature and other.
It has been generally acknowledged that the single example that surpasses threshold value can not enough indicate low air-conditioning charge level reliably.On the contrary, during driving event, monitor the air-conditioning cycle of predetermined quantity.When having recorded the low charge indication of predetermined quantity, close air-conditioning system and record diagnosis failure code in system storage.If recorded many unfavorable driving events, system can be stopped using air-conditioning system until air-conditioning system is keeped in repair.Pilot lamp or other alarm signal can be set to remind vehicle driver's air-conditioning system that needs repairing.
The invention discloses a kind of system that detects the low charge situation of cold-producing medium in vehicle air conditioning in test period, described system comprises: determine the vehicle speed sensor whether described vehicle turns round with stabilized speed, if and described vehicle is with stabilized speed running, described system exits described test period; Determine whether temperature sensor or the algoritic module in preset range of environment temperature; When while engaging by comparing compressor clutch, air-conditioning system mesohigh wall pressure is separated with compressor clutch, air-conditioning system mesohigh wall pressure is determined the pressure transducer of the pressure difference value of air-conditioning system cold-producing medium; With respect to threshold value, assess the controller of described pressure difference value; And, if described pressure difference value is less than described threshold value, the storer of the low charge situation of record-keeping system cryogen.
Read accompanying drawing and to after the description of disclosed embodiment, will be more readily understood these and other aspect of the present invention.
Accompanying drawing explanation
Fig. 1 is the operational block diagram that has adopted the system of the low charge situation of cold-producing medium in vehicle air conditioner that detects.
Embodiment
According to embodiments of the invention, can provide a kind of system that detects the low charge situation of cold-producing medium in vehicle air conditioning in test period.Described system can comprise: determine the vehicle speed sensor whether described vehicle turns round with stabilized speed, if described vehicle does not turn round with stabilized speed, described system exits described test period; Determine whether temperature sensor or the algoritic module in preset range of environment temperature; When while engaging by comparing compressor clutch, air-conditioning system mesohigh wall pressure is separated with compressor clutch, air-conditioning system mesohigh wall pressure is determined the pressure transducer of the pressure difference value of air-conditioning system cold-producing medium; With respect to threshold value, assess the controller of described pressure difference value; And if described pressure difference value is less than described threshold value, the storer of the low charge situation of record-keeping system cryogen.
Described system can further comprise the humidity sensor that induction moisture exists, and wherein, when humidity sensor senses moisture, described system exits described test period.
Described vehicle speed sensor can further comprise to described controller provides the gear chosen position indicator of input signal for verifying that described vehicle is just turning round with stabilized speed.
Described system can further comprise the low charge detection counter that increases low charge count value when each described pressure difference value is less than described threshold value.
Described system increases the low charge of actuation counter value and drives counter in the time of can further comprising the described vehicle of each driving and described low charge detection counter value increase, described controller is compared described low charge actuation counter value and in vehicle diagnosing system, sets diagnostic trouble code (DTC) with predetermined value, and when having set described diagnostic trouble code (DTC), described controller determines whether to reach good drive cycle minimal amount to remove described temperature diagnostic trouble code (DTC) (DTC).
With reference to figure 1, shown the operational block diagram of the system of disclosed embodiment of the present invention.Other embodiments of the invention can be derived, the object of using the low charge situation of cold-producing medium in the software detection vehicle air conditioner that utilizes existing Air-conditioning system sensor input can be realized.
In one embodiment, as shown in frame 10, vehicle motor moves.By check to determine whether air-conditioning system stops using, whether exist diagnostic trouble code (DTC) (DTC) or system previously whether to set mark at 12 places, start this system.In 14 place's system log (SYSLOG) air-conditioning system internal high pressure wall pressure.Once record high side pressure at 14 places, determined in 16 place's systems whether air conditioning clutch engages.If not, system returns to 14 again to record high side pressure.
If engaged at 16 place's clutch couplinges, system determines that whether the speed of a motor vehicle is fully stable to have allowed test period.By at least determining that in 20 place's audit vehicle input messages whether the speed of a motor vehicle is fully stable.Alternately, system can determine at 22 places whether vehicle accelerates, or also can determine at 24 places the whether correct gear in steady running of variator.Can use switch, sensor or data input to determine gear chosen position, these inputs are called gear chosen position indicator jointly.If determine that the speed of a motor vehicle is stable, system can be inputted from rainfall sensor 26 or wiper status signal acquisition, and determines whether to rain at 28 places.If do not determine at 28 places and raining, allow test to proceed.
If determine speed wobble at 18 places or determine and rain at 28 places, system can exit test period at 32 places subsequently.If at 30 places, determine from effector's air-conditioning demand due to adjusted steering order change (if for example children play air-conditioner controller and it is opened rapidly and is closed), system also can exit test period to prevent coarse result at 32 places.If test period exits at 32 places, the test period that system is back to 14 places starts.
System continues to circulate until determine that at 16 places air conditioning clutch engages, determines at 18 places that the speed of a motor vehicle is stable and determines at 28 places not rainy.If like this, system records high side pressure again at 34 places.System determines that whether clutch coupling is separated subsequently again at 36 places.If separated, the final high side pressure of systematic survey continuation are poor at 38 place's calculating pressures.If not separated at 36 place's clutch couplinges, the clutch coupling that system is back to 16 places engages decision block (as indicated in " A ").Subsequently the pressure differential of calculating is offered to the comparison function in the calculated threshold at 40 places.Algorithm or the value of the looking into table of the reference value of the speed of a motor vehicle that the rotation speed of the fan that the engine speed that the environment temperature that can provide based on 42 places, 44 places provide, 46 places provide or 48 places provide are determined threshold pressure difference.At least, system need to determine at 42 places suitable environment temperature should be how many.Definite engine speed 44, rotation speed of the fan 46 and alternative parameter or the additional parameter of the speed of a motor vehicle 48 for utilizing in different embodiments of the invention.The environment temperature that actual environment temperature is provided or senses by temperature sensor at 50 places.Alternately, can be by using the algorithm of other sensor input to infer this temperature.In addition, can provide rotation speed of the fan at 52 places, and the sensor in engine provides engine speed at 54 places.Can implement the present invention and without with reference to rotation speed of the fan variable 52 and engine speed variable 54.Yet, should from vehicle speed sensor, provide the speed of a motor vehicle at 56 places.The value of looking into table (comprising the environment temperature function at 42 places, the reference value of the rotation speed of the fan function at the engine speed function at 44 places, 46 places and the speed of a motor vehicle function at 48 places) the calculating pressure difference limen value that can take subsequently the sensor input of environment temperature 50, rotation speed of the fan 52, engine speed 54 and the speed of a motor vehicle 56 and provide as each variable.
The number of the low charge event of counting before 62 places are by 60 places is compared with each low charge fault value of maximum driving.By reference to the value of looking into table or system calibration, set the low charge fault value of maximum of determining each driving.The low charge fault value of maximum at every turn driving is compared at 64 places, determine whether to occur multiple faults with the low charge counting of increase.If not yet there is multiple faults, system is again returned to the beginning at 14 places and is recorded high side pressure.If there is multiple faults, system is set inactive air-conditioning sign and design temperature diagnostic trouble code (DTC) in engine control module subsequently.
System can relatively detect at 70 places the value of the drive cycle number of maximum low charge subsequently.If system is definite at 68 places, compared to calibration value, had multiple faults drive cycle, system can be at 72 place's design temperature diagnostic trouble code (DTC) the air-conditioning of stopping using.If not yet reached, maximum low charge drive cycle number detected, system compares to determine whether to reach minimum period number at 74 places by the good drive cycle number of the minimum with default.If good drive cycle outnumber preset number, can remove the temperature diagnostic trouble code (DTC) of previously having set at 76 places.
For example, if the low charge situation of cold-producing medium detected once in a while, but system indicates it to work well in most of cycle, and system can be removed temperature diagnostic trouble code (DTC) at 78 places.The reading indication air-conditioning system normal operation that meets the requirement of charge level repeating and the pressure in air-conditioning are applicable to air-conditioning and remain in operation.Predetermined good driving number is being set as after calibration value, and system will allow to remove temperature diagnostic trouble code (DTC).
After removing temperature diagnostic code, can remind driver to avoid the unnecessary maintenance to air-conditioning system at 80 places.Once remind driver, system is returned to its initial state and by again first determining at 12 places whether air-conditioning stops using or the no diagnostic trouble code (DTC) of design temperature or sign continue the running of monitoring system.
Although described in detail, carry out optimal mode of the present invention, those skilled in the relevant art of the present invention will recognize and implement multiple alternate design of the present invention defined by the claims and embodiment.
Claims (3)
1. a system that detects the low charge situation of cold-producing medium in vehicle air conditioning in test period, described system comprises:
Determine that described vehicle is whether with the vehicle speed sensor of stabilized speed running, and if described vehicle not with stabilized speed running, described system exits described test period;
Determine the whether temperature sensor in preset range of environment temperature;
When while engaging by comparing compressor clutch, air-conditioning system mesohigh wall pressure is separated with compressor clutch, air-conditioning system mesohigh wall pressure is determined the pressure transducer of the pressure difference value of air-conditioning system cold-producing medium;
With respect to threshold value, assess the controller of described pressure difference value;
If described pressure difference value is less than described threshold value, the storer of the low charge situation of record-keeping system cryogen;
Each described pressure difference value increases the low charge detection counter of low charge count value while being less than described threshold value;
The described vehicle of each driving and described low charge detection counter value increase the low charge of actuation counter value and drive counter while increasing, described controller is compared described low charge actuation counter value and in vehicle diagnosing system, sets diagnostic trouble code (DTC) with predetermined value, and when having set described diagnostic trouble code (DTC), described controller determines whether to reach good drive cycle minimal amount to remove described temperature diagnostic trouble code (DTC).
2. system according to claim 1, is characterized in that, described system further comprises the humidity sensor that induction moisture exists, and wherein, when humidity sensor senses moisture, described system exits described test period.
3. system according to claim 1, is characterized in that, described vehicle speed sensor further comprises to described controller provides the gear chosen position indicator of input signal for verifying that described vehicle is just turning round with stabilized speed.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US12/359,561 | 2009-01-26 | ||
| US12/359,561 US8205461B2 (en) | 2009-01-26 | 2009-01-26 | Method and system for detecting low refrigerant charge and air conditioner protection system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101788361A CN101788361A (en) | 2010-07-28 |
| CN101788361B true CN101788361B (en) | 2014-04-23 |
Family
ID=42353033
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201010105282.3A Expired - Fee Related CN101788361B (en) | 2009-01-26 | 2010-01-25 | System for detecting low charge of refrigerant in air conditioner protection system |
Country Status (2)
| Country | Link |
|---|---|
| US (1) | US8205461B2 (en) |
| CN (1) | CN101788361B (en) |
Families Citing this family (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| ES2733718T3 (en) * | 2009-06-19 | 2019-12-02 | Danfoss As | Method for determining wired connections in a steam compression system |
| US20110219790A1 (en) * | 2010-03-14 | 2011-09-15 | Trane International Inc. | System and Method For Charging HVAC System |
| DE102011006970A1 (en) * | 2011-03-23 | 2012-09-27 | Robert Bosch Gmbh | Method and diagnostic tester for detecting a fault in a cooling circuit of a motor vehicle |
| US9688116B2 (en) | 2011-09-23 | 2017-06-27 | Ford Global Technologies, Llc | Method for operating a vehicle climate control system |
| FR2987671B1 (en) * | 2012-03-05 | 2014-04-18 | Renault Sa | METHOD FOR MANAGING A THERMODYNAMIC DEVICE FOR A MOTOR VEHICLE, SYSTEM, PROGRAM, RECORDING MEDIUM AND VEHICLE THEREFOR |
| CN104132434A (en) * | 2014-08-07 | 2014-11-05 | 成都信鑫信息技术有限公司 | Automatic control system of automobile air conditioner |
| US9638446B2 (en) * | 2014-09-03 | 2017-05-02 | Mahle International Gmbh | Method to detect low charge levels in a refrigeration circuit |
| JP2016088437A (en) * | 2014-11-10 | 2016-05-23 | 株式会社デンソー | Failure diagnosis device of automobile air conditioner and failure diagnosis method |
| US9829229B2 (en) * | 2015-01-27 | 2017-11-28 | Johnson Controls Technology Company | System and method for detecting low refrigerant charge in a refrigeration system |
| CN104881019B (en) * | 2015-03-31 | 2017-11-03 | 南昌大学 | Household electrical appliances fault network maintenance system and its method |
| US10351138B2 (en) | 2017-11-17 | 2019-07-16 | Cummins Inc. | Active prognostics and diagnostics of engine-driven rotary accessories with intermittent duty cycles |
| CN110146318A (en) * | 2019-05-28 | 2019-08-20 | 格力电器（武汉）有限公司 | Solve the low method of air-conditioning entropy detection pressure testing power |
| CN112013583B (en) * | 2020-05-13 | 2022-04-26 | 北京机械设备研究所 | Integrated device for automatically detecting leakage and filling fluorine for high-power air conditioner |
| CN113417106B (en) * | 2021-06-28 | 2023-11-28 | 青岛海尔科技有限公司 | Washing machine steady operation method and device based on pressure sensor |
| US11833888B2 (en) | 2022-02-10 | 2023-12-05 | Ford Global Technologies, Llc | Method and system for protecting against low refrigerant charge in electrified vehicle |
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| US5201862A (en) * | 1989-02-13 | 1993-04-13 | General Motors Corporation | Low refrigerant charge protection method |
| CN1987246A (en) * | 2005-12-22 | 2007-06-27 | 乐金电子(天津)电器有限公司 | Method for detecting poor pressure sensor of air conditioner |
| CN101086369A (en) * | 2006-06-06 | 2007-12-12 | 乐金电子(天津)电器有限公司 | Control method of composite type air conditioner for preventing insufficient infusion of refrigerant |
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| US5251453A (en) | 1992-09-18 | 1993-10-12 | General Motors Corporation | Low refrigerant charge detection especially for automotive air conditioning systems |
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| US5481884A (en) | 1994-08-29 | 1996-01-09 | General Motors Corporation | Apparatus and method for providing low refrigerant charge detection |
| US6209333B1 (en) * | 1996-01-22 | 2001-04-03 | Rene F. Bascobert | Mobile air conditioning system and control mechanism |
| US6460354B2 (en) | 2000-11-30 | 2002-10-08 | Parker-Hannifin Corporation | Method and apparatus for detecting low refrigerant charge |
| JP3931739B2 (en) * | 2002-06-12 | 2007-06-20 | 株式会社デンソー | Refrigeration cycle equipment |
| US6672085B1 (en) * | 2002-10-24 | 2004-01-06 | Delphi Technologies, Inc. | Hierarchical control method for a motor vehicle HVAC system |
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| US7337619B2 (en) | 2004-05-25 | 2008-03-04 | Ford Motor Company | Method and system for assessing a refrigerant charge level in a vehicle air conditioning system |
-
2009
- 2009-01-26 US US12/359,561 patent/US8205461B2/en not_active Expired - Fee Related
-
2010
- 2010-01-25 CN CN201010105282.3A patent/CN101788361B/en not_active Expired - Fee Related
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5201862A (en) * | 1989-02-13 | 1993-04-13 | General Motors Corporation | Low refrigerant charge protection method |
| CN1987246A (en) * | 2005-12-22 | 2007-06-27 | 乐金电子(天津)电器有限公司 | Method for detecting poor pressure sensor of air conditioner |
| CN101086369A (en) * | 2006-06-06 | 2007-12-12 | 乐金电子(天津)电器有限公司 | Control method of composite type air conditioner for preventing insufficient infusion of refrigerant |
Also Published As
| Publication number | Publication date |
|---|---|
| US20100186430A1 (en) | 2010-07-29 |
| CN101788361A (en) | 2010-07-28 |
| US8205461B2 (en) | 2012-06-26 |
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